> The studies published by the Audio Engineering Society demonstrated that > jitter isn't audible until around 20,000 ps. I am also of the opinion > that the entire jitter problem was overhyped by marketers. They > basically created a problem were there was none. If you are aware of > any scientifically valid tests that prooves me wrong, please share it.
To make that argument, using the figure quoted, is, by it's very mathematical definition, implying that the specification of 16 bit audio is *far* in excess of that required for accurate musical reproduction. To anyone who enjoys music I think many would struggle to think they have a convincing facsimile of a real band performing in front of them; even the best HiFi in the world (whatever that may be) cannot acheive that illusion. 20,000ps equates, just on a simple mathematical analysis and ignoring additional errors present in the system, to around 51dB dynamic range! It implies the other 45dB (*non-dithered*, dithered dynamic range is greater than this) isn't required. The reality is most digital audio designers who actually are self-critical enough to listen, would usually aim for a significantly greater target dynamic range than that with the maths would indicate is adequate for a 16-bit, 44.1k sampled system. In my experience the difference is great, but that's all that matters to me, my experience. This is a bigger issue than headline figures like the one quoted above portray, jitter spectra is crucially important, and significantly affects the audibility. Does the AES article mention spectral content, if it doesn't I'd say it's seriously flawed, since again even the maths would indicate spectral content is important? Of equal importance in SPDIF applications is the impedance matching (i.e. reflections) on the SPDIF line. This latter area is one in which the SB's (great though they are for the money) are significantly flawed (along with probably 90+% of all other digital audio kit out there!). In fact the SPDIF specs call for a non-75R interface, if they are to be compliant, presumably because someone, at the system's inception and way before any modern developments, decided it would be 'adequate'. By all means believe it is though. Andy. -- Andrew L. Weekes ------------------------------------------------------------------------ Andrew L. Weekes's Profile: http://forums.slimdevices.com/member.php?userid=573 View this thread: http://forums.slimdevices.com/showthread.php?t=18116 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
